Study about the internal structure of plants is called plant anatomy. It is usually done by dissection and microscope examination of the plant tissue. By studying the internal structure we can see several similarities as well as differences in plant kingdom. In all plants cells form the basic unit. Cells are organized into tissues and in turn tissues into organs. The simple type in plant kingdom is the unicellular form, and the progressive evolution in plants has resulted in the increasing complexity of structures. In higher plants roots, stem, leaves, and flowers carry out different function. Due to these divisions of labour the cells of the plants are differentiated to form different tissues. Different organs in the plants have different structures. Within angiosperms the monocots and dicots show a great difference in their anatomy of root, stem, and leaf. By studying the anatomy of plants we can classify a part of the plant according to its division, phylum etc. Anatomy of the plants also shows the adaptations exhibited by the plants to diverse environment.